Had fun working in the snow today.
Tip. Keep moving, have flow up as high as you can so that it's not in the hose for long, don't stop and leave hose laying on ground for a long time with out pump running. As regards cleaning, snow is actually good, it's pure and adds a little more friction.
The first thing to normally freeze is the t piece at the brush. Water will also freeze on some conservatories and porches that have no heating.
Simon.